24 lines
715 B
Ruby
24 lines
715 B
Ruby
# frozen_string_literal: true
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module ColorsHelper
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HEX_COLOR_PATTERN = /\A\#(?:[0-9A-Fa-f]{3}){1,2}\Z/.freeze
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def hex_color_to_rgb_array(hex_color)
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raise ArgumentError, "invalid hex color `#{hex_color}`" unless hex_color =~ HEX_COLOR_PATTERN
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hex_color.length == 7 ? hex_color[1, 7].scan(/.{2}/).map(&:hex) : hex_color[1, 4].scan(/./).map { |v| (v * 2).hex }
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end
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def rgb_array_to_hex_color(rgb_array)
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raise ArgumentError, "invalid RGB array `#{rgb_array}`" unless rgb_array_valid?(rgb_array)
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"##{rgb_array.map{ "%02x" % _1 }.join}"
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end
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private
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def rgb_array_valid?(rgb_array)
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rgb_array.is_a?(Array) && rgb_array.length == 3 && rgb_array.all?{ _1 >= 0 && _1 <= 255 }
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end
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end
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